There is provided a binder for ceramic formation or a conductive paste, comprising polyvinyl acetal having a degree of acetalization of from 50 to 85 mol%, a content of vinyl ester monomer unit of from 0.1 to 20 mol%, and having a viscosity-average degree of polymerization of from 200 to 5000, wherein a peak-top molecular weight (A) as measured by a differential refractive index detector and a peak-top molecular weight (B) as measured by an absorptiometer (measurement wavelength: 280 nm) in gel permeation chromatographic measurement of the polyvinyl acetal heated at 230°C for 3 hours satisfy a formula (1) (A-B)/A < 0.60 and the polyvinyl acetal has an absorbance in the peak-top molecular weight (B) of from 0.50 × 10-3 to 1.00 × 10-2.
提供了一种用于陶瓷成型或导电浆料的粘结剂,它包括聚
乙烯醇缩醛,其
缩醛度为 50 至 85 摩尔%,
乙烯基酯单体单元含量为 0.其中,在凝胶渗透色谱法测量在 230°C 下加热 3 小时的聚
乙烯醇缩醛时,用差分折射率检测器测得的峰顶分子量 (A) 和用吸收仪(测量波长:280 纳米)测得的峰顶分子量 (B) 满足式 (1) (A-B)/A < 0.60,且聚乙烯醇
缩醛的峰顶分子量(B)吸光度为 0.50 × 10-3 至 1.00 × 10-2。